Electrostatic Definition and 884 Threads

electrostatic force! Homework Statement http://img10.imageshack.us/img10/3914/picture0117.jpg Homework Equations The Attempt at a Solution

hi, i'm trying to find a way to attract small dust particles in a household environment to a surface. i have no physics and no engineering skills whatsoever so this is all new to me, but what i am wanting to do is have a surface with a constant charge, as perhaps this is the way to achieve this...

Homework Statement Assuming that an infinitely long line charge of 50(pC/m) parallel to the y-axis at x=2(m) and z=1(m), determine the electric intensity at the point (-1, 5, -3). The answer given : -0.18(ax0.6 + az0.8)(V/m)Homework Equations Electric field intensity due to an infinite...

why does electrostatic potential obey superposition? it's a solution of poisson's equation and solutions of poisson's equation definitely do not obey superposition!

Homework Statement A particle with charge −9 μC is located on the x-axis at the point 8 cm, and a second particle with charge 5 μC is placed on the x-axis at 6 cm. The Coulomb constant is 8.9875 × 109 N · m2/C2. What is the magnitude of the total electrostatic force on a third particle with...

Homework Statement There's three thick, conducting concentric spheres with radii R1, R2, R3 (R1 < R2 < R3) with charge Q1, Q2, Q3 respectively. a.- The middle one is now wired to the ground. Find its net charge b.- The internal and external spheres are now wired. Find the distribution of all...

Homework Statement A sphere with radius R is charged with surface density σ. The charge found in a small surface Δs is repelled by the rest of the sphere, thus generating an electrostatic pressure. Find the pressure. Homework Equations The Attempt at a Solution I think I have to compute the...

Hi, I am more familiar with the world of biology and chemistry, however I am trying to come up with a method to evenly distribute dust over a surface area which may require a bit of Physics help. I was wondering is there any way of say, positively charging an aluminium foil surface and...

Is electromagnetic radiation affected, in any way, by a strong electrostatic field (or gradient of field)? Specifically, is it possible to reflect light with such a field or to confine an EM wave inside an electrostatic potential well?

this is short: is electrostatic just electricity that isn't moving and electricity is electricity moving? thanx :)

I'm a senior student in high school requesting assistance and/or evaluation of a small-scale electrostatic filter for computer usage as a dust remover to prevent or mitigate build up of dust inside a computer. Isometric pictures of the main parts are available. It is basically an...

Does a charged particle at rest (m0>0) have more total energy than an uncharged particle with the same rest mass at rest? Thanks in advance.

Homework Statement What is the electrostatic potential energy of an isolated spherical conductor of radius 24 cm that is charged to 3.9 kV? Homework Equations Electric potential U = (kQ)/r The Attempt at a Solution U = ((8.99 * 109 ) * (3.9 * 103)/(0.24) Could...

I'm doing a video analysis and there is a charged ball that a woman is holding and there is another charged ball hanging from a string with length L. The video is of the woman pushing the ball closer to the ball from the string and how it pushes it away and I am using LoggerPro to analyze the...

Homework Statement A charge of -3.00 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.125 m). The charges on the circle are -4.00 µC at the position due north and +5.00 µC at the position due east. What is the magnitude and...

electrostatic force? Homework Statement Two very small spheres are initially neutral and separated by a distance of 0.50 m. Suppose that 6.2 x 1013 electrons are removed from one sphere and placed on the other. What is the magnitude of the electrostatic force that acts on each sphere...

If a charged particle is moving in an electrostatic field is angular momentum conserved? I'm thinking it's only conserved if the electrostatic potential is constant throughout space

Homework Statement 3. Four charged particles are held fixed at the corners of a square of side s. All the charges have the same magnitude Q, but two are positive and two are negative. In Arrangement 1, shown , charges of the same sign are at opposite corners. Express...

Homework Statement Measurements show that a honeybee in active flight can acquire an electrostatic charge on the order of 93 pC. a)How many electrons much be transferred to produce this charge? Ne = * b) Supposing two bees, both with this charge, are separated by a distance of 12 cm...

Homework Statement The water molecule forms an angle, with hydrogen atoms at the tips and the oxygen atom at the vertex (see diagram in the previous problem). Assume that the angle at the oxygen atom is Θ = 103.5o and the distance between the oxygen and the hydrogen atoms is d = 93.1 x 10-9...

Homework Statement You have a lightweight spring whose unstretched length is 4.0 cm. You're curious to see if you can use this spring to measure charge. First, you attach one end of the spring to the ceiling and hang a 1.0 g mass from it. This stretches the spring to a length of 5.0 cm. You...

Homework Statement Two point charges, Q1 = -6.9 µC and Q2 = 1.1 µC are located between two oppositely charged parallel plates, as shown in Fig. 16-65. The two charges are separated by a distance of x = 0.38 m. Assume that the electric field produced by the charged plates is uniform and equal...

The other day I ran across a writeup for a general physics experiment (it might have come out of a high school AP course - I'm not sure) about using charged Scotch tape to separate charges for the purpose of measuring the charge through a torque equilibrium setup. The technique was to put a...

Homework Statement (Part 1) A hoop of charge of radius k lies in the y, z plane, centred on the x axis, so that it occupies the points (0, y, z) with y^2 + z^2 = k^2. If the (linear) charge density in the hoop is j, calculate the electrostatic potential Fi at all points on the x axis, and...

Homework Statement Four particles form a square. The charges are q_1 = q_4 = Q and q_2 = q_3 = q. (a) What is \frac Qq if the net electrostatic force on particles 1 and 4 is zero? (b) Is there any value of q that makes the net electrostatic force on each of the four particles 0...

Electrostatic forces helpp! Homework Statement Two spheres, each having a mass of 50.0 mg, are suspended from a common point by massless threads 50.0 cm long. One of the spheres have been given a charge twice that of the other. The strings make an angle of 6.00 degrees. What are the charges...

Homework Statement Show that all longitudinal waves must be electrostatic by using Faraday's law. Homework Equations Faraday's law: \frac{\partial \vec{B}}{\partial t} = - \nabla \times \vec{E} The Attempt at a Solution Where should I start??

Homework Statement This is just a thought experiment and I wanted to know if my answer is correct. If I... 1) Tie a string to one of the plastic combs and suspend this comb from the edge of a table 2) Then rub the suspended plastic comb in wool to give it a negative charge 3) and If I...

Homework Statement Consider the cross sections of two, very long, concentric, metallic, hollow cylinders placed in a vacuum. The small cylinder has inner radius A and outer radius B while the larger cylinder has inner radius 2A and outer radius 2B. Initially the small and big hollow...

Homework Statement I am comparing a normal DNA decamer molecule with one in which the two strands are only connected by the two base pairs on one of the ends. It was determined that the potential energies of both DNA molecules are negative, with values for the normal DNA much more negative...

I encountered a problem which goes like this: Two charges of mass m and charge q are initially positioned far from each other. Now one is projected towards the other with velocity v . Find the closest distance of approach. We( in class) solved the problem using energy conservation but I...

The original web http://farside.ph.utexas.edu/teaching/em/lectures/node56.html Reading the web which is posted above I got a question ... I need some masters to help me! My question : why not to remain the left term of eq539 instead of eliminating it by "Let us...

Two point-like objects carry charges of q1 = +4C and q2 = -3C and are separated by a fixed distance of 50 cm. (a) Determine the point (other than infinity) at which a point-like positive charge will experience zero net electrostatic force due to the two fixed charges. q1 = +4C ...... q2 =...

Consider an infinitely long stationary conductor which carries a steady uniform current. 1. At an arbitrary Test Point outside the conductor the Electric Field should be ZERO according to Maxwell's Equation. 2. But if Special theory of Relativity is considered, the moving charges...

How does ESD affect Aircraft and Aircraft Components?? Does anyone know?? Thanks...

1. All variables and given/known data: a = c = 1 \times 10^{-19} C b = 2 \times 10^{-19} C Distance between a&b = b&c = 0.1m (b at origin, a at (0, 0.1) and c at (0, -0.1)) 2. Homework Equations : F = k\frac{|q_1||q_2|}{r^2} 3. The problem that I'm having: Am I correct to...

Hi All, I am pretty new to COMSOL. I want design model of a sensor with four electrode. This sensor mainly based on impedance spectroscopy principle. The model should measure the distance and thickness of the obstacle due to change in capacitive impedance of electrostatic field between the...

1. A body will maintain a constant negative electrostatic charge if the body 1) Maintains the same excess of electrons. 3) Continuously receives more electrons than it loses. I chose 3) but I think both choices work. However, the correct answer is 1), I don’t why 3) is wrong. 2...

I have the problem and my work uploaded to this webpage. I believe I have the general idea down, but I'm just afraid that I've done a careless calculation and missed a minus sign somewhere. I feel that my results have a lot of negative signs, making the potential constantly negative. I'm not...

Homework Statement I have a solid, insulating, finite-thickness spherical shell (inner radius a, outer radius b). It's uniformly charged with a total charge of Q. I'm looking for the electric field E, "everywhere in space, including points outside and inside the spherical shell" Also...

why like charges repel n unlike charge attract each other?

Homework Statement Three charged particles form a triangle: particle 1 with charge Q1=80nC is at xy coordinates (0,3.00mm) particle 2 with charge q2 is at (0,-3.00mm) and particle 3 is at(4.00mm,0). In unit vector notation, what is the electrostatic force on particle 3 due to the other two...

Homework Statement A charge of -4.10 C is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.137 m). The charges on the circle are -3.58 C at the position due north and +6.79 C at the position due east. What is (a) the magnitude and...

The problem: Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of 0.158 N when their center-to-center separation is 63.2 cm. The spheres are then connected by a thin conducting wire. When the wire is removed, the spheres repel each other with an...

So I have this homework question that I answered already but still don't understand why the answer is correct. A positively charged ball is brought close to an electrically neutral isolated conductor. The conductor is then grounded while the ball is kept close. Is the conductor charged...

Homework Statement Three charges are arranged as shown in the figure. Figure (Attached Below Could not insert the image, wouldn't work for me) Find the magnitude of the electrostatic force on the charge at the origin. Answer in units of nN. What is the angle theta betwen the...

Homework Statement Of the charge Q initially on a tiny sphere, a portion q is to be transferred to a second, nearby sphere. Both spheres can be treated a particles. For what value of q/Q>0.5 will the electrostatic force between the two parts have 1/2 of the maximum possible value? The...

2 balls with a mass of 100kg are at a distance of 5m from one another, how many electrons need to be moved from one to the other in order to balance the gravitational force by an electric force, from what i understand, we have 2 neutral balls of the same mass, and i need to find out how much...

Hi, I've had a pretty good experience with physics forum in the past, so when I ran across something I couldn't find an answer to on the web, I figured why not ask it here.. I found a great introduction to electrostatic charge decay located at...

hey, i have a question from an exam paper which isn't worded too nicely (most of the questions on the exam are worded in similar ways ) The way I've done it is to first put in my first shell of infintesimal charge and then treat it as a point charge. Then i treat the next shell as just a point...